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Thread: Colt factory magazine block from early AR-15 rifle

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  1. #1
    Really Senior Member RCS's Avatar
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    Colt factory magazine block from early AR-15 rifle

    When Colt started selling the AR-15 Sporters to the civilian market they placed a magazine block in their magazines that only allowed five cartridges (for hunting).

    Interesting to collectors is that not many of these magazine blocks are found today as most were soon thrown away

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    Contributing Member rcathey's Avatar
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    Very neat. It’s fun to think about all the things that are super rare and valuable simply because they were at one time worthless!
    Old ammo boxes, stuff like this magazine block, and the list goes on. Today’s trash, tomorrow's treasure.

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    Member Boonie Stomper's Avatar
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    When I purchased my SP1 (1982) in came with a 5 rd, blocked mag. The seller offered to swap it for a "normal" 20 rd. mag & I declined. The collector in me was intrigued by anything unusual & non-ordinary.

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    Really Senior Member RCS's Avatar
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    Thread Starter

    also the early AR-15 bolt carrier

    Found this early bolt carrier (center in photo) in both three and four digit Colt SP1 semi auto sporter rifles. The machining is quite different from the common full auto and semi auto bolt carriers

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    Advisory Panel browningautorifle's Avatar
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    That was done so the FA kits wouldn't work with the also new hammers...with the notch at the top. With the bottom carrier they would catch and cause a stoppage.
    Regards, Jim

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    Advisory Panel Lee Enfield's Avatar
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    Quote Originally Posted by browningautorifleicon View Post
    That was done so the FA kits wouldn't work with the also new hammers...with the notch at the top. With the bottom carrier they would catch and cause a stoppage.
    http://www.quarterbore.com/nfa/lightninglink.html

    Which resulted in the "lightning link"...
    BSN from the Republic of Alberta

    http://www.cartridgecollectors.org/

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    Advisory Panel browningautorifle's Avatar
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    Quote Originally Posted by Lee Enfield View Post
    Which resulted in the "lightning link"
    Yes, another method. I just use ex FA parts, converted except an SA selector. They all seem to run better. Leave the bolt alone...
    Regards, Jim

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    Contributing Member fjruple's Avatar
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    Additionally the cut on the bottom bolt carrier was done so the safety lever can be placed on safe with the bolt carrier to the rear.

    Cheers

    --fjruple

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    Advisory Panel browningautorifle's Avatar
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    That makes sense too, mechanically. Can't see why one would want to do it though...range rules?

    Regards, Jim

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